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Bioaccumulation of Macronutrients in Edible Mushrooms in Various Habitat Conditions of NW Poland—Role in the Human Diet

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Bioaccumulation of Macronutrients in Edible Mushrooms in Various Habitat Conditions of NW Poland—Role in the Human Diet International Journal of Environmental Research and Public Health Article Bioaccumulation of Macronutrients in Edible Mushrooms in Various Habitat Conditions of NW Poland—Role in the Human Diet Ryszard Malinowski 1,* , Zofia Sotek 2, Małgorzata Stasi ´nska 2, Katarzyna Malinowska 3, Patrycja Radke 4 and Alicja Malinowska 5 1 Department of Environmental Management, West Pomeranian University of Technology in Szczecin, Słowackiego 17 Street, 71-434 Szczecin, Poland 2 Institute of Marine and Environmental Sciences, University of Szczecin, Adama Mickiewicza 16 Street, 70-383 Szczecin, Poland; zofi[email protected] (Z.S.); [email protected] (M.S.) 3 Department of Bioengineering, West Pomeranian University of Technology in Szczecin, Słowackiego 17 Street, 71-434 Szczecin, Poland; [email protected] 4 Institute of Biology, University of Szczecin, W ˛aska12 Street, 71-899 Szczecin, Poland; [email protected] 5 Faculty of Medicine and Dentistry, Major Medicine, Pomeranian Medical University in Szczecin, Rybacka 1 Street, 70-204 Szczecin, Poland; [email protected] * Correspondence: [email protected] Abstract: Recently, the interest in mushroom consumption has been growing, since their taste and low calorific value are appreciated, but also due to their nutritional value. In determining the usefulness Citation: Malinowski, R.; Sotek, Z.; of mushrooms in the human diet, it is important to consider the conditions of their occurrence to Stasi´nska,M.; Malinowska, K.; Radke, perform the assessment of bioaccumulation of minerals. The aim of the study was: (a) to determine P.; Malinowska, A. Bioaccumulation the content of selected macronutrients (P, K, Ca, Mg, Na) in fruiting bodies of Boletus edulis, Imleria of Macronutrients in Edible badia, Leccinum scabrum and the soils, (b) to determine their bioaccumulation potential taking into Mushrooms in Various Habitat account the habitat conditions, and (c) an attempt to estimate their role in covering the requirement Conditions of NW Poland—Role in for macronutrients of the human organism. The research material was obtained in the NW of Poland: the Human Diet. Int. J. Environ. Res. Uznam and Wolin, the Drawa Plain and the I´nskoLakeland. In the soil, we determined the content of Public Health 2021, 18, 8881. https:// organic matter, pH, salinity and the content of absorbable and general forms of macronutrients. The doi.org/10.3390/ijerph18168881 content of macronutrients in mushrooms was also determined. Chemical analyses were performed Academic Editors: Jerzy Falandysz, using the generally accepted test methods. The study showed that in NW Poland, B. edulis grew on Roland Treu and Ji Zhang the acidic soils of Arenosols, and I. badia and L. scabrum grew on Podzols. The uptake of K, Mg and Ca by the tested mushrooms was positively, and P and Na negatively correlated with the content of these Received: 6 July 2021 elements in the soil. The acidity of the soil affected the uptake of K and Mg by mushrooms. There was Accepted: 19 August 2021 no effect of the amount of organic matter in the soil noticed on the content of macronutrients (except Published: 23 August 2021 sodium) in mushrooms. Among the studied macronutrients, none of the mushrooms accumulated Ca, while P and K were generally accumulated in the highest amounts, regardless of the species. Publisher’s Note: MDPI stays neutral Each of the other elements was usually accumulated at a similar level in the fruiting bodies of the with regard to jurisdictional claims in species we studied. The exception was I. badia, which accumulated higher amounts of Mg compared published maps and institutional affil- to B. edulis and L. scabrum. Mushrooms can enrich the diet with some macronutrients, especially in P iations. and K. Keywords: fungi; macroelements; properties of soil; Boletus edulis; Leccinum scabrum; Imleria badia Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article 1. Introduction distributed under the terms and conditions of the Creative Commons Wild edible mushrooms in many countries, especially in central and eastern Europe in Attribution (CC BY) license (https:// autumn, when they appear more often, are a frequent element in the human diet. Recently, creativecommons.org/licenses/by/ the interest in their consumption has been increasing, not only because of the taste, but 4.0/). also due to their nutritional value [1–3]. The main mass of mushroom fruiting bodies is Int. J. Environ. Res. Public Health 2021, 18, 8881. https://doi.org/10.3390/ijerph18168881 https://www.mdpi.com/journal/ijerph Int. J. Environ. Res. Public Health 2021, 18, 8881 2 of 15 water, on average 90% by weight. On the other hand, the dry matter of mushrooms has a diversified composition. Depending on the species, they contain carbohydrates in the range from about 3 to 42% DM, protein from 4 to 44 (max 57.3)% DM and lipids from 2 to 6% DM [4,5]. This differentiation occurs even within the same genus, e.g., Boletus spp. contain in dry matter 21.6 to 25.8% crude protein, 61.7–75% carbohydrates, 3.0–5.8% lipids and 5.7–8.2% ash [6,7]. Mushrooms contain more and qualitatively better nutritional protein than most plants [4,8,9]. Moreover, they are characterized by a low caloric value, generally not exceeding 200 kJ/100 g of dry matter. They also contain many vitamins from the C and B group (niacin, folic acid), small amounts of vitamin D and several polyphenols and carotenoid [10–12]. Like plants, they contain significant amounts of macroelements, especially a lot of phosphorus and potassium, slightly less magnesium, and small amounts of sodium and calcium [4,13–15]. However, the degree of bioavailability of these elements from consumed mushrooms is as of yet unknown [4,16]. The growth of mushrooms and their uptake of macroelements is closely related to the chemical and physical properties of soil, including organic matter, and in case of mycorrhizal mushrooms, also to the symbiosis with plant roots [17–19]. Due to the specific structure of the mycelium—the exposed surface of vegetative cells and the large surface of hyphae—mushrooms easily absorb minerals even at small amounts in the soil, which often results in a much higher concentration of minerals in fruiting bodies compared to the substrate [20–23]. Mushrooms also have the ability to absorb elements from dust deposited on fruiting bodies [8]. The excess of accumulated macronutrients (e.g., P and N) is used by mycorrhizal mushrooms to exchange with plants for the products of photosynthesis [24–26]. Poland is one of the leading producing countries for mushrooms. In 2017, 7302 tons of mushrooms were collected here, and in 2018, 3261 tons, including 2057 tons of bay boletes and 248 tons of boletuses, while in 2019, 5912 tons were collected [27]. The differentiation in the purchase of mushrooms in particular years was related to the weather conditions. However, regarding the popularity of mushroom picking in local communities, these figures do not reflect the actual amount of mushrooms actually consumed. Therefore, due to the ability to accumulate macronutrients, mushrooms can—at least when consumed often—constitute a significant supplement to the human diet with these elements. In Poland, the most commonly harvested wild mushrooms include the species which are the subject of our research: Boletus edulis, Imleria badia and Leccinum scabrum. Previous studies on the usefulness of these species in covering the demand for minerals necessary for the proper development and functioning of the organism did not take into account the conditions of their accumulation by fruiting bodies of mushrooms from NW Poland. Therefore, our research focused on this region. The aim of the study was: (a) to determine the content of selected macronutrients (P, K, Ca, Mg, Na) in fruiting bodies of B. edulis, I. badia, L. scabrum and the soils; (b) to determine their bioaccumulation potential taking into account the habitat conditions; and (c) an attempt to estimate their role in covering the requirement for macronutrients of the human organism. 2. Materials and Methods 2.1. Study Area The mushrooms were collected in three physiographic regions of NW Poland: Uznam and Wolin, the Drawsko Plain and the I´nskoLakeland [28]. Uznam and Wolin are the islands separating the Szczecin Lagoon from the Pomeranian Bay. Mushrooms for research were collected in the north-eastern part of the Wolin island. The low ridges of shore dunes covered by dry pine forests create the dominant topography in that region. The Drawsko Plain is an extensive outwash plain drained by Drawa river and its tributaries. The quite monotonous landscape of this region is diversified by numerous lakes, mid-forest pools and peat bogs. The Drawsko Plain is covered mainly by pine forests. The I´nskoLakeland is hilly morainic upland intersected by numerous glacial troughs. Apart from the moraine hills Int. J. Environ. Res. Public Health 2021, 18, 8881 3 of 15 and ravines, the region has numerous post-glacial lakes and pools, and vast water-logged area. In this region, the dense forests are present mostly in the zone of terminal moraine. 2.2. Fungal and Soil Materials Three species of the most commonly picked wild-growing edible mushrooms in Poland were selected for the study: Boletus edulis, Imleria badia and Leccinum scabrum. The locations of material collection were in the distance from communication routes, and there were no other sources of environmental pollution in these areas as well. During the sampling, attention was paid to make sure that the fruiting bodies of the same species are collected in different places, are fully developed and are not attacked by insects, snails and molds. From each of the three studied regions, 3–7 pooled samples of each species were collected, with each pooled sample consisting of 5 fruiting bodies.
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